Homemade Onion Dip

0 Melt butter together with the olive oil in heavy skillet over medium-high heat.
1 Add onions and garlic.
2 Sprinkle lightly with the salt and sauté until onions begin to turn golden and caramelize. Stir frequently. This will take about 15 minutes.
3 Reduce heat to medium and continue to sauté until onions are deep golden brown, about 10 to 15 minutes longer. Be careful because they can burn easily at this point.
4 Remove from heat and cool onions to room temperature.
5 Coarsely chop onion mixture with the spatula.
6 Combine sour cream, cream cheese, and worcestershire in a bowl.
7 Mix until well blended.
12 Fold in the onions.
8 Season to taste with salt.
9 Transfer to serving bowl.
10 Cover; chill at least 1 hour.
11 Keep refrigerated until about 30 minutes before serving.
13 Garnish with chopped green onions and a sprinkle of Montreal Steak Seasoning  if desired.